So, I’m up late writing. And because of the events in my book (underground city, some volcanic activity) I needed to know what happened when sulfur gets set on fire. I knew it was flamable, but the color, for instance, and to what degree escaped me.
… Apparently, this is what happens: [link]
See those fantastic blue rivers glowing in the dark, halfway down the page? That’s liquid sulfur.
What an amazing effect.